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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7373724e340f1c36da6b73b78c24558fcf9e719b0b3064fe2615315447f7527a' 
  AND token = 'WTFG1wUom6QyUEou0j0i8TXieHgIcyC02/fGZO3BSdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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