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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4d31e0641922fc2a7903645d4082c42da65ffa2aea9804f7fe005a4ddfd3a6' 
  AND token = '9O4oBSJ/UkSeJsJV/khs1lUPr/tYhxZULYKmsdmCS7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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