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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1423c0c83b24e73ed20c513094c4027db930906ea1166be0f939ce0dc739ea1f' 
  AND token = 'aq0WnoTqiss8D1RJRrgFeBb92sHu7y8CX658KLLNmSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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