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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99067025a11dc5f2ba810d3bb49bf7cf69d51fc48bfe716797b991d19379f62a' 
  AND token = 'o0XPAu7W5Ai4kjJOO0rrUhC76Hi8nuRp9kYv/8MQhoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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