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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937c2c1e21b0c5b71f37e286d6c2d7cf685bf1a6ed929be678d94c4730871114' 
  AND token = 'wMej4OSySMrMK21Dyz+mAPOaeBAXMzz8uTzDH6byCds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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