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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b71bb944a5b0a21f7196e9517cc8e7d918f2d58a7256449fef67eac791fc7c4' 
  AND token = 'eoNLXequOiDBYp/fLe3Pn9+TXRHoVpgK16vvS3/qBV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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