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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74859410fb92ef05a7581eb854b37b4c0c3044a611921e05122d6cb5b9e519b2' 
  AND token = 'acSU8lSbgp8DLTD5dHdSaBI/Xpo+1w5yB4QD/WXiang=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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