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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a59cf6f588d6e0e26897205577636ed75385a0fc162be8c45882c978ded0b3' 
  AND token = 'SxUd0utGx3MOvHpF2ivOkEcvzwv9pcTbl8yDV7Lr5q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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