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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fe6740899553bc95364bf393e898056b7da359f7f4b13354b520368e334e45' 
  AND token = 'jZo9U60TSfV2YTGx27/RfB7pfMxqblKsNY5yOfyxhdI=' 
  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"
    }
  }
}