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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51683ac81e29ae462b1fdef5e99673121d169a57d39b0599511307dab9fc21e' 
  AND token = '950hCBkht06Ojc0B05jSzfU/mgQbP3qzbSJ87D1oLjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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