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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcfda13407ff1f9a3fbdfb6961a4e6576ebce5b2550e71e0d17b4618bdc18c6' 
  AND token = 'cwUb6R87ZJEsM5Df/yMMtQYpA2jl2KqkN988rJFIczg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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