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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc83e6ce822d21ae5951544eb56d5d1d2f7804ca14dafdf0951a165c186aaf2' 
  AND token = 'V21thTBE/OfpnktNXrEp/DV1aazBSkHfzsRZ4KqMEMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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