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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0f35aecfef50b360633ccd09118414f71a9b64175417bc28b74ac6addb24eb' 
  AND token = 'ABYnkZt1360PEY1o0ukBn5myIDvUbOF1Y1h0NnVfa6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}