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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84ac3e63abd88de3d3e296a0761e5b8121326d962948c9da4a61524dc123dd4' 
  AND token = 'uxYKLTh+9QWVNB6S9Xp7xsaWcTfv2RAIhQ9bgH16ME8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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