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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46fbbf7d9f0b8427accb0f01d06ffadcf0792af6e14a63514c0f44a8f994b0bf' 
  AND token = '2hDiLxLYZ6OY2Qf075bUSALgOCivixAOgi8uLykbFYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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