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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9437b90fd70df5632ad7d14775df3bec6ea7bf8b5448bf06eab5bc72c6722c87' 
  AND token = 'NALwf7NCIYj7j3ny3LuRHPAX8ev5/6MmdVVJWGBbpm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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