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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2736b702b85ad88ff2df840d26003772c6af8cc7bf2b7d137202f8df6dd5fa2' 
  AND token = 'L6ht3CNJ7XKfytzR2mSxEiXvDC34Nv7FbscQNkcS5f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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