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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c612b1592e8e2d542cc4cff890603010a0e49be4aee70be77def51b26fb46a0' 
  AND token = 'pH/124iSjYJ2CMQ4VNxR6xqzW8bGf9VMMqLqzqUrZBo=' 
  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"
    }
  }
}