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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5c4101ddd1984b036a958bfb2db0591f3eb6d343806ca04614042178fb1c49' 
  AND token = 'LZ0phevLbG+MgAWw50Fn1AHw2qzNW6H5jf3xki6BjuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00226

JSON explain

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