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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6600bc63b6262a015241145e77c68b107bf6f869e4df433129ae13d3dad149ac' 
  AND token = 'omrK4dZNtXso8V4+stKPzjkxiDyvguy2G6kjoExC+us=' 
  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"
    }
  }
}