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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89be70adee923fb1fa4d9b9052eb16273b8cf54c13c9e0ac39b001c0cab2e23' 
  AND token = '5ATRT0JAFbi2iVnn1Tq7boLCDeHtMJM1cum1MGZRtSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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