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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c144458c392ed2a7c263db88a010bec64007405116ba9afc7a16013591b65433' 
  AND token = '/z1Obb9Br7tnRHwPH24kwlZ2uOAg4dJJ9mQqoFJG1Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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