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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d439a599b0c502b3c2647266632b54161d33191e80a8388c76f1fccd2ae8bb' 
  AND token = 'mV0f4PlB6FxdV2MmVAQ8kP6Rw0DNyOsHhLH826GDnNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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