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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97278c4eb413ec7f2d23cc239829b18584db3dc157e2cf78e3daf0b1fe1b36f' 
  AND token = 'ExLbh9YtYsl05yTN4OD8mCFndi+P0htl9/P4eoQWAi4=' 
  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"
    }
  }
}