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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c1d842eb36143b778cc106adccbd8baa7b083f9ba73e255665f180c416210c' 
  AND token = 'kDVsCCZIwyIGNyVeLW5m0VTTOh0fBhwWunX+lr6eInM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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