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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe53496632d5d7548b8efc82da3a02bd49c60f982e8738b795d73d7a4ad4e8b' 
  AND token = 'EOS52uP3w1nmeMcxIYN2GZuVVbBXlHF8ZOMg4riwjE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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