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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0e685f7250b54b39ff81c376b7bfd94c5cf6327b2e034da76cda78cc22883a' 
  AND token = 'cyNeK6WdAOTXePsdTKfOZ6F8JxDV5fp8trPh9+EiT7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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