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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b110d52c005901d35a3b3f422d6733287a555a46e3daca0c679c47d6eafe5746' 
  AND token = '5a0/CemBwI8YcLIajJiJ5khbOqMXHP5Bb9484TOuIDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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