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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb9dfcf4dfde1c45f604d8d09f0542e0e13d4b818fdc56014a96ddcd245a434' 
  AND token = 'OSeaN+m8ScNH5dmQ5D99TP4P/I3QydJMdev96hjn0Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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