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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af26e365dffea0b35b873c29af042296b3c1c2445b6276f496dee66923ed1c6' 
  AND token = '2jXabSiTYqF2Bs+9lN0XmBfULiw9KH4MnPziSGYE3No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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