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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84345feac30d5d00064f79a83d7c8cc80847c729567984d762139d89c05ebced' 
  AND token = 'jGmbMFHNGL17u2idnTm/gIJj87JbztL5Tau/LaaqvRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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