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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574e3a10628a33a44ad0e6588f0d4ffab3251eef42576b9377fc508f84058dfa' 
  AND token = 'TCIcMyygQPdl8Rfeh0FpY+XeEEjjnimbcH7FY8slatw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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