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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4eddda9bbd8617f77f229fe69cf19dd89a5d3203b939cc96cf0cfe97ba9aefd' 
  AND token = 'zpjphMd80RHOZvF9zhKbTp5SET0/7J1j5ogwOPN+KMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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