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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbdc3e3c26b1e406d5f120d32d4b8c0027cb82f4f564224f52680174788c869' 
  AND token = 'Zapw2AHJUUE00XZdZJMfkz6pnGJM4wxRyJB8QK10xWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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