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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301720244fe38e840b53cf891d3ec7872c9bcda727f3270666cfdf94e0e4d090' 
  AND token = 'OX30Yo8YF/NlnHnqDeRPc2f7ddZI1T+HgWfJTwQGXi4=' 
  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"
    }
  }
}