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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b3f1c3ae86ca28c28f110e41fcaa7b38a3e7ad4c841428b1dd5db5cce4e4dc' 
  AND token = 'FzYufr6To4TL2/bGr5/CX1D7VPRa0/BgQ/4v+ODwJpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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