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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbce898b34853b23b267d1dd22e3349323ad3d1d1239f733483a3ffd9932eb3' 
  AND token = 'xTPQ+omrPGHadCn8V1kh9U78hBycqamkDL1pYJcFmnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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