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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8738589310b9a232a9e72b86f9e1c48e93020aef181516a1854fb5e0bea7c399' 
  AND token = 'DZ1ii6UUJRI6hXfDY8x19N8XEIjeZT87zauE06Ay/u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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