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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69867a6aecb23bac8e285c6fc41dae3e6a171fdfaefe8c16afdb287ede5c05fa' 
  AND token = '+UCM2H/95Z5ZTy1qzjO64uEbzeiSpsMk84Am/8XNyPc=' 
  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"
    }
  }
}