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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8694ce91dacf7d52105203a6d7537ed8c75da88b887693d108e0fdecbf1adc06' 
  AND token = '/26GJAb/iTwjfjLFMLX1jsVN3FouH1evR9SLu3F1pUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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