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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1ec86b6c46c0ef74e8a80743bb30e4775dca43d650f25f042ac96adee20dd6' 
  AND token = 'pas92d2cDmBXCTdGu2iqY/O/h62V15ALdnIbUnaapgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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