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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ebadc4b95d90b5546ba6f191b01e75192d3c067f1adc9cba66d2f998b2b84c' 
  AND token = 'nQYyumJFVf2o7NJZ/ZxjSxt6nxi27QErOYtzj8nZnI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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