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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5ca21c08763be02d95e1755e36195ece2a3d161456ec626e89f162dcb88a13' 
  AND token = 'bQYvcXVl6kM1KJuEJrPiyl6+a2rLDxCznB7ER3jwJNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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