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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0078acd8937bfca457576b3a08d7edd3f740a50ced1758df7b0ebd1861f31140' 
  AND token = '3wDPCVdbWx3sloUEuK/U1T6udvpT8zUaRUDZdz0Z5yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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