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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b15d3914efbbb028f0ae50f5f4d709d50816786c8b00fe189ad336cfb0c7966' 
  AND token = '/7i+aFRnQ1uEOGZEmxfHdvahdwnnVK7C8cGtoSBE7FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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