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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79156a5a16d6ead31cc99bb531cf5dc27080de13b5b274ed65b001f39629a3c3' 
  AND token = '/fEdNhk6Jb5e8aVnMdzif2WZhgcasv8RkqqEJm58McY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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