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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6ab2a1e63cccd372e1561cd0da14aafbcd7971a4177af7dca6d13028cee62e' 
  AND token = 'BPQLOpwzIQwstQ8awgmT/GRkJTl1geLeX9Gt3MOadVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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