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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ff09b20fb5e8bfb347e2d617abaa4ad866d0017e7dc8181258ea72ebb29e7c' 
  AND token = 'ps0aQrE6VX/sVVvZKIRJZK1GG0oq0X2pE3K7BWaXAR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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