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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59748aab3649e7da9c6d14c44951142c684b3956a54226d1ae6e10592d41a4a5' 
  AND token = 'J/A5pQSif3nlJONhSv9KxNLhcMhPA/3kl77yO+bYMiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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