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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7710fbd1d76997ff3509eabc7cd7a01a6a260be56f8b67610531ce53293d8aff' 
  AND token = '2WaYUIFwG4sSDoiO0LUHDSpUOugkPWeYYfqRylJQ0+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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