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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e077eeb46de83989aa993e750de9e40a250a1c663cc6a2b8ab4503efc86bf58' 
  AND token = 'Hk0Id2Xn4KOZnPGOn5tJ22X/hq6YAzyy4kRnILgSkVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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