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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e061b0a2a23862d8858feea01c4dbd1a831d84d83bdb0be94fb9071c5eb0c63' 
  AND token = 't6w9Txe/tfr24Z1oRLJqee9zp0D4WR5AZyl8h4wgiBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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