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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb8b585738bfb137690f435140b5706d506f6c8aa7ff4cd54940e77d41a3592' 
  AND token = 'Nw9u8wuhg4BRQ1xHR4R3nwnlB1mvHVu+3lShRtOfOMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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