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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0970e80407023dcf43befc6798b72fa899c413ea3edc505145414031831acf7c' 
  AND token = '+v0j5Y6z3Y0DN6pB6Jg9ASPX/ZT4O8RmM5H/WcHBPPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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