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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1b789f82e68fe1cde09d45aef9afd31f35e0674579d789ca30fe5d663cf1ab' 
  AND token = 'jOLTIyb/ElOEfznQiIAcN0cAZ8uRMDlCrEdhP7bM2gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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